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SURFACE roughness of electrospun nanofibrous mats by a novel image processing technique
, Article Surface Review and Letters ; 2018 ; 0218625X (ISSN) ; Kasaei, S ; Haghi, A. K ; Sharif University of Technology
World Scientific Publishing Co. Pte Ltd
2018
Abstract
A novel technique based on image processing inspired by the simple assumption for the first time to assess the roughness of nanofibrous mats based on grayscale variations is proposed. The height of a nanofibrous mat in different regions of the surface is simulated by grayscale variations in the image while the relation between grayscale and height is obtained as a linear function. The roughness is obtained by measuring height variations in the surface profile. Statistical roughness parameters of nanofibrous mats are also obtained from direct measurement with roughness profilometry and atomic force microscopy (AFM) for comparison of the roughness of nanofibrous mats between direct measurement...
Surface roughness of electrospun nanofibrous mats by a novel image processing technique
, Article Surface Review and Letters ; Volume 26, Issue 1 , 2019 ; 0218625X (ISSN) ; Kasaei, S ; Haghi, A. K ; Sharif University of Technology
World Scientific Publishing Co. Pte Ltd
2019
Abstract
A novel technique based on image processing inspired by the simple assumption for the first time to assess the roughness of nanofibrous mats based on grayscale variations is proposed. The height of a nanofibrous mat in different regions of the surface is simulated by grayscale variations in the image while the relation between grayscale and height is obtained as a linear function. The roughness is obtained by measuring height variations in the surface profile. Statistical roughness parameters of nanofibrous mats are also obtained from direct measurement with roughness profilometry and atomic force microscopy (AFM) for comparison of the roughness of nanofibrous mats between direct measurement...
Surface roughness of electrospun nanofibrous mats by a novel image processing technique
, Article Surface Review and Letters ; Volume 26, Issue 1 , 2019 ; 0218625X (ISSN) ; Kasaei, S ; Khodaparast Haghi, A ; Sharif University of Technology
World Scientific Publishing Co. Pte Ltd
2019
Abstract
A novel technique based on image processing inspired by the simple assumption for the first time to assess the roughness of nanofibrous mats based on grayscale variations is proposed. The height of a nanofibrous mat in different regions of the surface is simulated by grayscale variations in the image while the relation between grayscale and height is obtained as a linear function. The roughness is obtained by measuring height variations in the surface profile. Statistical roughness parameters of nanofibrous mats are also obtained from direct measurement with roughness profilometry and atomic force microscopy (AFM) for comparison of the roughness of nanofibrous mats between direct measurement...
Investigation of segregation of large particles in a pressurized fluidized bed with a high velocity gas: A discrete particle simulation
, Article Powder Technology ; Volume 246 , September , 2013 , Pages 398-412 ; 00325910 (ISSN) ; Hosseini, S. A ; Soleimani, R ; Sharif University of Technology
2013
Abstract
A numerical study on mixing/segregation phenomena in a pressurized fluidized bed with large particles of Geldart D type of binary density but same diameter with high velocity gas was performed by the use of discrete particle simulation. Particle mixtures are composed of spherical particles with 2mm diameter and 1g/cm3 flotsam density and different jetsam densities of 1.25, 2 and 2.5g/cm3 with jetsam volume fraction of 0.5. The particles are initially packed approaching perfect mixing state in a rectangular bed and then fluidized by gas uniformly injected at the bottom of the bed. Effect of increase of pressure and density ratio was investigated and mixing/segregation behavior is discussed in...